The farmer said, "There is a three-point harvest." Whole seedlings are the basis for high production in cotton production. At present, it is a critical period for the preservation of seedlings. The management techniques in this period mainly include the following:
First, timely drilling hole
When the emergence of cotton reaches more than 80%, it can be gargoyled to adjust the internal temperature and temperature of the membrane, which can avoid cold damage and prevent burning at high temperature. If the seedling stage just meets the high temperature period, it should change the traditional practice of “greening and not letting go of yellowâ€. Whether the cotyledon is yellow or green, the seedlings should be placed in the hole and the seedlings that have not yet turned green should be placed on the cotton seedlings. Cover a wet soil that is 5 cm thick to prevent the yellow sprouts from dying quickly when the water is quickly dehydrated. The time for placing the seedlings in the hole should be strictly controlled before 9:00 in the morning and after 5:00 in the afternoon. In contrast, it is best to place the seedlings after 5 pm in the afternoon. The technique of membrane seedling laying is to lift the film on one side of the narrow row and flip it to the big row when the emergence of cotton seedlings reaches more than 80%. In order to prevent high temperature burning seedlings and low-temperature freezing damage, when the emergence of more than 80% can choose the lee side, the mulch film segment with the support, the film should be placed in the sunny day morning or afternoon, cloudy day can be carried out all day .
Second, timely check seedlings, fill seedlings to ensure that the whole seedlings
After the emergence of cotton, it is necessary to check the seedlings in time to make up for the deficiency. The seedlings can be replenished with water in 30% of the cotton fields. For the fields with seedlings less than 20%, the seedlings can be preserved by thickening and thinning.
Third, and time seedlings, Dingmiao timely
Immediately after the cotton seedlings emerged, the seedlings were sparsed, and 3-4 true leaves were planted in due time. The seedling density was determined according to the planned seedling density, and the individual seedlings were left with double seedlings.
Fourth, the cultivator loose soil
Seedlings should be cultivated in time to eliminate weeds, increase ground temperature, increase soil permeability, and reduce pests and diseases. To reach strong seedlings and promote early-onset hair.
V. Preventing pests and diseases at a proper time
1. Diseases at the seedling stage are mainly blight, stem blight, and anthrax. It is necessary to strengthen field management, increase the number of cultivating, increase the temperature of the ground, eradicate germs and remove weeds. If necessary, use fungicides for foliar spraying to prevent and control diseases.
2, seedling pests are mainly locusts, thrips, small tigers, to pay special attention to timely prevention and treatment. Prevention and control of aphids, thrips, etc. should be selected to have a strong contact and insecticides for prevention and control.
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